Effective, homemade ant traps are simple enough to make yourself ... In a small bowl or cup, mix 1 tablespoon of borax (a laundry booster related to boric acid, but milder) with 1 tablespoon ...

and place the prepared trap in the garden, ideally where there are the most insects. The sugar will attract the ants, which will eagerly eat the mixture and poison themselves with the borax.